Question - What do you understand by Data Independence? What are its two types?
Answer -
Data Independence refers to the ability to modify the schema definition in one level in such a way that it does not affect the schema definition in the next higher level.
The 2 types of Data Independence are:
- Physical Data Independence: It modifies the schema at the physical level without affecting the schema at the conceptual level.
- Logical Data Independence: It modifies the schema at the conceptual level without affecting or causing changes in the schema at the view level.